W77IE58_06 Datasheet, PDF (5/82 Pages) Winbond – 8-BIT MICROCONTROLLER

W77IE58/W77I058A
Pin Description, continued
SYMBOL
TYPE
DESCRIPTIONS
PORT 3: Port 3 is a bi-directional I/O port with internal pull-ups. All bits have
alternate functions, which are described below:
RXD (P3.0) : Serial Port 0 input
TXD (P3.1) : Serial Port 0 output
P3.0−P3.7
INT0 (P3.2) : External Interrupt 0
I/O _{INT1 (P3.3) : External Interrupt 1}
T0 (P3.4) : Timer 0 External Input
T1 (P3.5) : Timer 1 External Input
WR (P3.6) : External Data Memory Write Strobe
P4.0−P4.3
RD (P3.7) : External Data Memory Read Strobe
PORT 4: Port 4 is a 4-bit bi-directional I/O port. The P4.0 also provides the
I/O
alternate function WAIT which is the wait state control signal.
Note: TYPE I: input, O: output, I/O: bi-directional.
Publication Release Date: November 10, 2006
-5-
Revision A7